Finding the Fourth Proportional to 42,700.38, 58,909.59 and 28,530.78

Step by Step Solution

1. Step 1: Write the proportion equation
   42,700.38 : 58,909.59 = 28,530.78 : x
2. Step 2: Convert to fraction form
   42,700.38/58,909.59 = 28,530.78/x
3. Step 3: Cross multiply
   42,700.38x = 58,909.59 × 28,530.78
4. Step 4: Simplify right side
   42,700.38x = 1,680,736,552.18
5. Step 5: Solve for x
   x = 1,680,736,552.18/42,700.38
6. Step 6: Final answer
   x = 39,361.16