Finding the Fourth Proportional to 78,490.92, 108,316.86 and 42,680.94

Step by Step Solution

1. Step 1: Write the proportion equation
   78,490.92 : 108,316.86 = 42,680.94 : x
2. Step 2: Convert to fraction form
   78,490.92/108,316.86 = 42,680.94/x
3. Step 3: Cross multiply
   78,490.92x = 108,316.86 × 42,680.94
4. Step 4: Simplify right side
   78,490.92x = 4,623,065,402.65
5. Step 5: Solve for x
   x = 4,623,065,402.65/78,490.92
6. Step 6: Final answer
   x = 58,899.37