Finding the Fourth Proportional to 111,987.66, 154,488.50 and 71,669.10

Step by Step Solution

1. Step 1: Write the proportion equation
   111,987.66 : 154,488.50 = 71,669.10 : x
2. Step 2: Convert to fraction form
   111,987.66/154,488.50 = 71,669.10/x
3. Step 3: Cross multiply
   111,987.66x = 154,488.50 × 71,669.10
4. Step 4: Simplify right side
   111,987.66x = 11,072,051,755.35
5. Step 5: Solve for x
   x = 11,072,051,755.35/111,987.66
6. Step 6: Final answer
   x = 98,868.50