Finding the Fourth Proportional to 81,131.42, 112,534.17 and 78,973.58

Step by Step Solution

1. Step 1: Write the proportion equation
   81,131.42 : 112,534.17 = 78,973.58 : x
2. Step 2: Convert to fraction form
   81,131.42/112,534.17 = 78,973.58/x
3. Step 3: Cross multiply
   81,131.42x = 112,534.17 × 78,973.58
4. Step 4: Simplify right side
   81,131.42x = 8,887,225,714.56
5. Step 5: Solve for x
   x = 8,887,225,714.56/81,131.42
6. Step 6: Final answer
   x = 109,541.12