Finding the Fourth Proportional to 111,915.72, 154,454.58 and 83,572.20

Step by Step Solution

1. Step 1: Write the proportion equation
   111,915.72 : 154,454.58 = 83,572.20 : x
2. Step 2: Convert to fraction form
   111,915.72/154,454.58 = 83,572.20/x
3. Step 3: Cross multiply
   111,915.72x = 154,454.58 × 83,572.20
4. Step 4: Simplify right side
   111,915.72x = 12,908,109,050.68
5. Step 5: Solve for x
   x = 12,908,109,050.68/111,915.72
6. Step 6: Final answer
   x = 115,337.77