Finding the Fourth Proportional to 139,381.16, 208,555.05 and 83,251.80

Step by Step Solution

1. Step 1: Write the proportion equation
   139,381.16 : 208,555.05 = 83,251.80 : x
2. Step 2: Convert to fraction form
   139,381.16/208,555.05 = 83,251.80/x
3. Step 3: Cross multiply
   139,381.16x = 208,555.05 × 83,251.80
4. Step 4: Simplify right side
   139,381.16x = 17,362,583,623.78
5. Step 5: Solve for x
   x = 17,362,583,623.78/139,381.16
6. Step 6: Final answer
   x = 124,569.09