Finding the Fourth Proportional to 137,979, 190,411.20 and 78,363

Step by Step Solution

1. Step 1: Write the proportion equation
   137,979 : 190,411.20 = 78,363 : x
2. Step 2: Convert to fraction form
   137,979/190,411.20 = 78,363/x
3. Step 3: Cross multiply
   137,979x = 190,411.20 × 78,363
4. Step 4: Simplify right side
   137,979x = 14,921,192,865.60
5. Step 5: Solve for x
   x = 14,921,192,865.60/137,979
6. Step 6: Final answer
   x = 108,141.04