Finding the Fourth Proportional to 111,418.79, 153,708.17 and 66,098.70

Step by Step Solution

1. Step 1: Write the proportion equation
   111,418.79 : 153,708.17 = 66,098.70 : x
2. Step 2: Convert to fraction form
   111,418.79/153,708.17 = 66,098.70/x
3. Step 3: Cross multiply
   111,418.79x = 153,708.17 × 66,098.70
4. Step 4: Simplify right side
   111,418.79x = 10,159,909,885.89
5. Step 5: Solve for x
   x = 10,159,909,885.89/111,418.79
6. Step 6: Final answer
   x = 91,186.69