Finding the Fourth Proportional to 139,407.13, 208,993.15 and 60,461.90

Step by Step Solution

1. Step 1: Write the proportion equation
   139,407.13 : 208,993.15 = 60,461.90 : x
2. Step 2: Convert to fraction form
   139,407.13/208,993.15 = 60,461.90/x
3. Step 3: Cross multiply
   139,407.13x = 208,993.15 × 60,461.90
4. Step 4: Simplify right side
   139,407.13x = 12,636,122,410.22
5. Step 5: Solve for x
   x = 12,636,122,410.22/139,407.13
6. Step 6: Final answer
   x = 90,641.87