Finding the Fourth Proportional to 111,156.60, 153,296.72 and 81,012.18

Step by Step Solution

1. Step 1: Write the proportion equation
   111,156.60 : 153,296.72 = 81,012.18 : x
2. Step 2: Convert to fraction form
   111,156.60/153,296.72 = 81,012.18/x
3. Step 3: Cross multiply
   111,156.60x = 153,296.72 × 81,012.18
4. Step 4: Simplify right side
   111,156.60x = 12,418,901,474.05
5. Step 5: Solve for x
   x = 12,418,901,474.05/111,156.60
6. Step 6: Final answer
   x = 111,724.37