Finding the Fourth Proportional to 139,152.30, 192,050.80 and 88,169.78

Step by Step Solution

1. Step 1: Write the proportion equation
   139,152.30 : 192,050.80 = 88,169.78 : x
2. Step 2: Convert to fraction form
   139,152.30/192,050.80 = 88,169.78/x
3. Step 3: Cross multiply
   139,152.30x = 192,050.80 × 88,169.78
4. Step 4: Simplify right side
   139,152.30x = 16,933,076,784.82
5. Step 5: Solve for x
   x = 16,933,076,784.82/139,152.30
6. Step 6: Final answer
   x = 121,687.37