Finding the Fourth Proportional to 42,688.48, 58,839.60 and 28,536.16

Step by Step Solution

1. Step 1: Write the proportion equation
   42,688.48 : 58,839.60 = 28,536.16 : x
2. Step 2: Convert to fraction form
   42,688.48/58,839.60 = 28,536.16/x
3. Step 3: Cross multiply
   42,688.48x = 58,839.60 × 28,536.16
4. Step 4: Simplify right side
   42,688.48x = 1,679,056,239.94
5. Step 5: Solve for x
   x = 1,679,056,239.94/42,688.48
6. Step 6: Final answer
   x = 39,332.77