Finding the Fourth Proportional to 78,130.68, 107,820.29 and 42,320.61

Step by Step Solution

1. Step 1: Write the proportion equation
   78,130.68 : 107,820.29 = 42,320.61 : x
2. Step 2: Convert to fraction form
   78,130.68/107,820.29 = 42,320.61/x
3. Step 3: Cross multiply
   78,130.68x = 107,820.29 × 42,320.61
4. Step 4: Simplify right side
   78,130.68x = 4,563,020,443.18
5. Step 5: Solve for x
   x = 4,563,020,443.18/78,130.68
6. Step 6: Final answer
   x = 58,402.42