Finding the Fourth Proportional to 111,111.75, 153,279.54 and 75,312.99

Step by Step Solution

1. Step 1: Write the proportion equation
   111,111.75 : 153,279.54 = 75,312.99 : x
2. Step 2: Convert to fraction form
   111,111.75/153,279.54 = 75,312.99/x
3. Step 3: Cross multiply
   111,111.75x = 153,279.54 × 75,312.99
4. Step 4: Simplify right side
   111,111.75x = 11,543,940,463.22
5. Step 5: Solve for x
   x = 11,543,940,463.22/111,111.75
6. Step 6: Final answer
   x = 103,894.87