Finding the Fourth Proportional to 89,428.32, 123,375.69 and 57,615.75

Step by Step Solution

1. Step 1: Write the proportion equation
   89,428.32 : 123,375.69 = 57,615.75 : x
2. Step 2: Convert to fraction form
   89,428.32/123,375.69 = 57,615.75/x
3. Step 3: Cross multiply
   89,428.32x = 123,375.69 × 57,615.75
4. Step 4: Simplify right side
   89,428.32x = 7,108,382,911.12
5. Step 5: Solve for x
   x = 7,108,382,911.12/89,428.32
6. Step 6: Final answer
   x = 79,486.93