Finding the Fourth Proportional to 142,352, 196,444.32 and 78,686.72

Step by Step Solution

1. Step 1: Write the proportion equation
   142,352 : 196,444.32 = 78,686.72 : x
2. Step 2: Convert to fraction form
   142,352/196,444.32 = 78,686.72/x
3. Step 3: Cross multiply
   142,352x = 196,444.32 × 78,686.72
4. Step 4: Simplify right side
   142,352x = 15,457,559,203.43
5. Step 5: Solve for x
   x = 15,457,559,203.43/142,352
6. Step 6: Final answer
   x = 108,586.88