Finding the Fourth Proportional to 139,487.86, 192,491.40 and 75,826.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139,487.86 : 192,491.40 = 75,826.72 : x
2. Step 2: Convert to fraction form
   139,487.86/192,491.40 = 75,826.72/x
3. Step 3: Cross multiply
   139,487.86x = 192,491.40 × 75,826.72
4. Step 4: Simplify right side
   139,487.86x = 14,595,991,490.21
5. Step 5: Solve for x
   x = 14,595,991,490.21/139,487.86
6. Step 6: Final answer
   x = 104,639.87