Finding the Fourth Proportional to 156,646.72, 216,176.72 and 85,026.88

Step by Step Solution

1. Step 1: Write the proportion equation
   156,646.72 : 216,176.72 = 85,026.88 : x
2. Step 2: Convert to fraction form
   156,646.72/216,176.72 = 85,026.88/x
3. Step 3: Cross multiply
   156,646.72x = 216,176.72 × 85,026.88
4. Step 4: Simplify right side
   156,646.72x = 18,380,832,030.23
5. Step 5: Solve for x
   x = 18,380,832,030.23/156,646.72
6. Step 6: Final answer
   x = 117,339.40