Finding the Fourth Proportional to 139,485.80, 192,312.23 and 90,340.61

Step by Step Solution

1. Step 1: Write the proportion equation
   139,485.80 : 192,312.23 = 90,340.61 : x
2. Step 2: Convert to fraction form
   139,485.80/192,312.23 = 90,340.61/x
3. Step 3: Cross multiply
   139,485.80x = 192,312.23 × 90,340.61
4. Step 4: Simplify right side
   139,485.80x = 17,373,602,755.40
5. Step 5: Solve for x
   x = 17,373,602,755.40/139,485.80
6. Step 6: Final answer
   x = 124,554.63