Finding the Fourth Proportional to 48,086.87, 72,121.25 and 13,021.91

Step by Step Solution

1. Step 1: Write the proportion equation
   48,086.87 : 72,121.25 = 13,021.91 : x
2. Step 2: Convert to fraction form
   48,086.87/72,121.25 = 13,021.91/x
3. Step 3: Cross multiply
   48,086.87x = 72,121.25 × 13,021.91
4. Step 4: Simplify right side
   48,086.87x = 939,156,590.61
5. Step 5: Solve for x
   x = 939,156,590.61/48,086.87
6. Step 6: Final answer
   x = 19,530.42