Finding the Fourth Proportional to 499,654,513.86, 689,569,484.49 and 276,636,196.05

Step by Step Solution

1. Step 1: Write the proportion equation
   499,654,513.86 : 689,569,484.49 = 276,636,196.05 : x
2. Step 2: Convert to fraction form
   499,654,513.86/689,569,484.49 = 276,636,196.05/x
3. Step 3: Cross multiply
   499,654,513.86x = 689,569,484.49 × 276,636,196.05
4. Step 4: Simplify right side
   499,654,513.86x = 190,759,879,101,473,088
5. Step 5: Solve for x
   x = 190,759,879,101,473,088/499,654,513.86
6. Step 6: Final answer
   x = 381,783,560.06