Finding the Fourth Proportional to 156,978.59, 217,200.92 and 136,877.36

Step by Step Solution

1. Step 1: Write the proportion equation
   156,978.59 : 217,200.92 = 136,877.36 : x
2. Step 2: Convert to fraction form
   156,978.59/217,200.92 = 136,877.36/x
3. Step 3: Cross multiply
   156,978.59x = 217,200.92 × 136,877.36
4. Step 4: Simplify right side
   156,978.59x = 29,729,886,748.78
5. Step 5: Solve for x
   x = 29,729,886,748.78/156,978.59
6. Step 6: Final answer
   x = 189,388.17