Finding the Fourth Proportional to 345,139.50, 517,787.67 and 105,274.86

Step by Step Solution

1. Step 1: Write the proportion equation
   345,139.50 : 517,787.67 = 105,274.86 : x
2. Step 2: Convert to fraction form
   345,139.50/517,787.67 = 105,274.86/x
3. Step 3: Cross multiply
   345,139.50x = 517,787.67 × 105,274.86
4. Step 4: Simplify right side
   345,139.50x = 54,510,022,922.05
5. Step 5: Solve for x
   x = 54,510,022,922.05/345,139.50
6. Step 6: Final answer
   x = 157,936.21