Finding the Fourth Proportional to 28,498.77, 42,750.89 and 7,439.18

Step by Step Solution

1. Step 1: Write the proportion equation
   28,498.77 : 42,750.89 = 7,439.18 : x
2. Step 2: Convert to fraction form
   28,498.77/42,750.89 = 7,439.18/x
3. Step 3: Cross multiply
   28,498.77x = 42,750.89 × 7,439.18
4. Step 4: Simplify right side
   28,498.77x = 318,031,342.82
5. Step 5: Solve for x
   x = 318,031,342.82/28,498.77
6. Step 6: Final answer
   x = 11,159.48