Finding the Fourth Proportional to 139,801.83, 192,928.72 and 76,139.57

Step by Step Solution

1. Step 1: Write the proportion equation
   139,801.83 : 192,928.72 = 76,139.57 : x
2. Step 2: Convert to fraction form
   139,801.83/192,928.72 = 76,139.57/x
3. Step 3: Cross multiply
   139,801.83x = 192,928.72 × 76,139.57
4. Step 4: Simplify right side
   139,801.83x = 14,689,509,781.45
5. Step 5: Solve for x
   x = 14,689,509,781.45/139,801.83
6. Step 6: Final answer
   x = 105,073.80