Finding the Fourth Proportional to 78,149.02, 107,845.50 and 42,340

Step by Step Solution

1. Step 1: Write the proportion equation
   78,149.02 : 107,845.50 = 42,340 : x
2. Step 2: Convert to fraction form
   78,149.02/107,845.50 = 42,340/x
3. Step 3: Cross multiply
   78,149.02x = 107,845.50 × 42,340
4. Step 4: Simplify right side
   78,149.02x = 4,566,178,470
5. Step 5: Solve for x
   x = 4,566,178,470/78,149.02
6. Step 6: Final answer
   x = 58,429.12