Finding the Fourth Proportional to 102,011.34, 140,773.79 and 56,688.50

Step by Step Solution

1. Step 1: Write the proportion equation
   102,011.34 : 140,773.79 = 56,688.50 : x
2. Step 2: Convert to fraction form
   102,011.34/140,773.79 = 56,688.50/x
3. Step 3: Cross multiply
   102,011.34x = 140,773.79 × 56,688.50
4. Step 4: Simplify right side
   102,011.34x = 7,980,254,994.42
5. Step 5: Solve for x
   x = 7,980,254,994.42/102,011.34
6. Step 6: Final answer
   x = 78,229.10