Finding the Fourth Proportional to 85,020, 116,835.12 and 81,117.42

Step by Step Solution

1. Step 1: Write the proportion equation
   85,020 : 116,835.12 = 81,117.42 : x
2. Step 2: Convert to fraction form
   85,020/116,835.12 = 81,117.42/x
3. Step 3: Cross multiply
   85,020x = 116,835.12 × 81,117.42
4. Step 4: Simplify right side
   85,020x = 9,477,363,499.79
5. Step 5: Solve for x
   x = 9,477,363,499.79/85,020
6. Step 6: Final answer
   x = 111,472.17