Finding the Fourth Proportional to 42,131.34, 58,150.35 and 28,734.57

Step by Step Solution

1. Step 1: Write the proportion equation
   42,131.34 : 58,150.35 = 28,734.57 : x
2. Step 2: Convert to fraction form
   42,131.34/58,150.35 = 28,734.57/x
3. Step 3: Cross multiply
   42,131.34x = 58,150.35 × 28,734.57
4. Step 4: Simplify right side
   42,131.34x = 1,670,925,302.60
5. Step 5: Solve for x
   x = 1,670,925,302.60/42,131.34
6. Step 6: Final answer
   x = 39,659.91