Finding the Fourth Proportional to 139,422.99, 209,016.91 and 60,477.78

Step by Step Solution

1. Step 1: Write the proportion equation
   139,422.99 : 209,016.91 = 60,477.78 : x
2. Step 2: Convert to fraction form
   139,422.99/209,016.91 = 60,477.78/x
3. Step 3: Cross multiply
   139,422.99x = 209,016.91 × 60,477.78
4. Step 4: Simplify right side
   139,422.99x = 12,640,878,699.26
5. Step 5: Solve for x
   x = 12,640,878,699.26/139,422.99
6. Step 6: Final answer
   x = 90,665.67