Finding the Fourth Proportional to 99,409.16, 137,187.78 and 56,981

Step by Step Solution

1. Step 1: Write the proportion equation
   99,409.16 : 137,187.78 = 56,981 : x
2. Step 2: Convert to fraction form
   99,409.16/137,187.78 = 56,981/x
3. Step 3: Cross multiply
   99,409.16x = 137,187.78 × 56,981
4. Step 4: Simplify right side
   99,409.16x = 7,817,096,892.18
5. Step 5: Solve for x
   x = 7,817,096,892.18/99,409.16
6. Step 6: Final answer
   x = 78,635.58