Finding the Fourth Proportional to 102,105.36, 140,901.12 and 56,781

Step by Step Solution

1. Step 1: Write the proportion equation
   102,105.36 : 140,901.12 = 56,781 : x
2. Step 2: Convert to fraction form
   102,105.36/140,901.12 = 56,781/x
3. Step 3: Cross multiply
   102,105.36x = 140,901.12 × 56,781
4. Step 4: Simplify right side
   102,105.36x = 8,000,506,494.72
5. Step 5: Solve for x
   x = 8,000,506,494.72/102,105.36
6. Step 6: Final answer
   x = 78,355.40