Finding the Fourth Proportional to 156,667.71, 216,201.93 and 85,047.78

Step by Step Solution

1. Step 1: Write the proportion equation
   156,667.71 : 216,201.93 = 85,047.78 : x
2. Step 2: Convert to fraction form
   156,667.71/216,201.93 = 85,047.78/x
3. Step 3: Cross multiply
   156,667.71x = 216,201.93 × 85,047.78
4. Step 4: Simplify right side
   156,667.71x = 18,387,494,178.22
5. Step 5: Solve for x
   x = 18,387,494,178.22/156,667.71
6. Step 6: Final answer
   x = 117,366.20