Finding the Fourth Proportional to 102,915, 142,022.70 and 55,811

Step by Step Solution

1. Step 1: Write the proportion equation
   102,915 : 142,022.70 = 55,811 : x
2. Step 2: Convert to fraction form
   102,915/142,022.70 = 55,811/x
3. Step 3: Cross multiply
   102,915x = 142,022.70 × 55,811
4. Step 4: Simplify right side
   102,915x = 7,926,428,909.70
5. Step 5: Solve for x
   x = 7,926,428,909.70/102,915
6. Step 6: Final answer
   x = 77,019.18