Finding the Fourth Proportional to 78,139.68, 107,832.72 and 42,330

Step by Step Solution

1. Step 1: Write the proportion equation
   78,139.68 : 107,832.72 = 42,330 : x
2. Step 2: Convert to fraction form
   78,139.68/107,832.72 = 42,330/x
3. Step 3: Cross multiply
   78,139.68x = 107,832.72 × 42,330
4. Step 4: Simplify right side
   78,139.68x = 4,564,559,037.60
5. Step 5: Solve for x
   x = 4,564,559,037.60/78,139.68
6. Step 6: Final answer
   x = 58,415.38