Finding the Fourth Proportional to 499,062,390.09, 688,659,879.83 and 276,039,271.86

Step by Step Solution

1. Step 1: Write the proportion equation
   499,062,390.09 : 688,659,879.83 = 276,039,271.86 : x
2. Step 2: Convert to fraction form
   499,062,390.09/688,659,879.83 = 276,039,271.86/x
3. Step 3: Cross multiply
   499,062,390.09x = 688,659,879.83 × 276,039,271.86
4. Step 4: Simplify right side
   499,062,390.09x = 190,097,171,786,088,128
5. Step 5: Solve for x
   x = 190,097,171,786,088,128/499,062,390.09
6. Step 6: Final answer
   x = 380,908,630.99