Finding the Fourth Proportional to 136,870.52, 189,011.72 and 129,416.08

Step by Step Solution

1. Step 1: Write the proportion equation
   136,870.52 : 189,011.72 = 129,416.08 : x
2. Step 2: Convert to fraction form
   136,870.52/189,011.72 = 129,416.08/x
3. Step 3: Cross multiply
   136,870.52x = 189,011.72 × 129,416.08
4. Step 4: Simplify right side
   136,870.52x = 24,461,155,876.46
5. Step 5: Solve for x
   x = 24,461,155,876.46/136,870.52
6. Step 6: Final answer
   x = 178,717.49