Finding the Fourth Proportional to 42,102.90, 58,071.60 and 28,650.42

Step by Step Solution

1. Step 1: Write the proportion equation
   42,102.90 : 58,071.60 = 28,650.42 : x
2. Step 2: Convert to fraction form
   42,102.90/58,071.60 = 28,650.42/x
3. Step 3: Cross multiply
   42,102.90x = 58,071.60 × 28,650.42
4. Step 4: Simplify right side
   42,102.90x = 1,663,775,730.07
5. Step 5: Solve for x
   x = 1,663,775,730.07/42,102.90
6. Step 6: Final answer
   x = 39,516.89