Finding the Fourth Proportional to 42,507.60, 58,599.60 and 28,355.28

Step by Step Solution

1. Step 1: Write the proportion equation
   42,507.60 : 58,599.60 = 28,355.28 : x
2. Step 2: Convert to fraction form
   42,507.60/58,599.60 = 28,355.28/x
3. Step 3: Cross multiply
   42,507.60x = 58,599.60 × 28,355.28
4. Step 4: Simplify right side
   42,507.60x = 1,661,608,065.89
5. Step 5: Solve for x
   x = 1,661,608,065.89/42,507.60
6. Step 6: Final answer
   x = 39,089.67