Finding the Fourth Proportional to 142,651.59, 196,856.79 and 78,988.02

Step by Step Solution

1. Step 1: Write the proportion equation
   142,651.59 : 196,856.79 = 78,988.02 : x
2. Step 2: Convert to fraction form
   142,651.59/196,856.79 = 78,988.02/x
3. Step 3: Cross multiply
   142,651.59x = 196,856.79 × 78,988.02
4. Step 4: Simplify right side
   142,651.59x = 15,549,328,410.46
5. Step 5: Solve for x
   x = 15,549,328,410.46/142,651.59
6. Step 6: Final answer
   x = 109,002.14