Finding the Fourth Proportional to 74,590.72, 102,911.96 and 42,320

Step by Step Solution

1. Step 1: Write the proportion equation
   74,590.72 : 102,911.96 = 42,320 : x
2. Step 2: Convert to fraction form
   74,590.72/102,911.96 = 42,320/x
3. Step 3: Cross multiply
   74,590.72x = 102,911.96 × 42,320
4. Step 4: Simplify right side
   74,590.72x = 4,355,234,147.20
5. Step 5: Solve for x
   x = 4,355,234,147.20/74,590.72
6. Step 6: Final answer
   x = 58,388.42