Finding the Fourth Proportional to 42,699.88, 58,908.90 and 28,530.28

Step by Step Solution

1. Step 1: Write the proportion equation
   42,699.88 : 58,908.90 = 28,530.28 : x
2. Step 2: Convert to fraction form
   42,699.88/58,908.90 = 28,530.28/x
3. Step 3: Cross multiply
   42,699.88x = 58,908.90 × 28,530.28
4. Step 4: Simplify right side
   42,699.88x = 1,680,687,411.49
5. Step 5: Solve for x
   x = 1,680,687,411.49/42,699.88
6. Step 6: Final answer
   x = 39,360.47