Finding the Fourth Proportional to 111,931.49, 154,461.89 and 66,599.10

Step by Step Solution

1. Step 1: Write the proportion equation
   111,931.49 : 154,461.89 = 66,599.10 : x
2. Step 2: Convert to fraction form
   111,931.49/154,461.89 = 66,599.10/x
3. Step 3: Cross multiply
   111,931.49x = 154,461.89 × 66,599.10
4. Step 4: Simplify right side
   111,931.49x = 10,287,023,024.80
5. Step 5: Solve for x
   x = 10,287,023,024.80/111,931.49
6. Step 6: Final answer
   x = 91,904.64