Finding the Fourth Proportional to 111,298.57, 153,795.71 and 81,031.36

Step by Step Solution

1. Step 1: Write the proportion equation
   111,298.57 : 153,795.71 = 81,031.36 : x
2. Step 2: Convert to fraction form
   111,298.57/153,795.71 = 81,031.36/x
3. Step 3: Cross multiply
   111,298.57x = 153,795.71 × 81,031.36
4. Step 4: Simplify right side
   111,298.57x = 12,462,275,158.98
5. Step 5: Solve for x
   x = 12,462,275,158.98/111,298.57
6. Step 6: Final answer
   x = 111,971.57