Finding the Fourth Proportional to 162,090.72, 243,160.32 and 56,891.20

Step by Step Solution

1. Step 1: Write the proportion equation
   162,090.72 : 243,160.32 = 56,891.20 : x
2. Step 2: Convert to fraction form
   162,090.72/243,160.32 = 56,891.20/x
3. Step 3: Cross multiply
   162,090.72x = 243,160.32 × 56,891.20
4. Step 4: Simplify right side
   162,090.72x = 13,833,682,397.18
5. Step 5: Solve for x
   x = 13,833,682,397.18/162,090.72
6. Step 6: Final answer
   x = 85,345.31