Finding the Fourth Proportional to 139,420.24, 209,012.80 and 60,475

Step by Step Solution

1. Step 1: Write the proportion equation
   139,420.24 : 209,012.80 = 60,475 : x
2. Step 2: Convert to fraction form
   139,420.24/209,012.80 = 60,475/x
3. Step 3: Cross multiply
   139,420.24x = 209,012.80 × 60,475
4. Step 4: Simplify right side
   139,420.24x = 12,640,049,080
5. Step 5: Solve for x
   x = 12,640,049,080/139,420.24
6. Step 6: Final answer
   x = 90,661.51