Finding the Fourth Proportional to 123,920.64, 185,591.52 and 90,557.28

Step by Step Solution

1. Step 1: Write the proportion equation
   123,920.64 : 185,591.52 = 90,557.28 : x
2. Step 2: Convert to fraction form
   123,920.64/185,591.52 = 90,557.28/x
3. Step 3: Cross multiply
   123,920.64x = 185,591.52 × 90,557.28
4. Step 4: Simplify right side
   123,920.64x = 16,806,663,242.27
5. Step 5: Solve for x
   x = 16,806,663,242.27/123,920.64
6. Step 6: Final answer
   x = 135,624.41