Finding the Fourth Proportional to 78,619.71, 108,495.12 and 42,809.97

Step by Step Solution

1. Step 1: Write the proportion equation
   78,619.71 : 108,495.12 = 42,809.97 : x
2. Step 2: Convert to fraction form
   78,619.71/108,495.12 = 42,809.97/x
3. Step 3: Cross multiply
   78,619.71x = 108,495.12 × 42,809.97
4. Step 4: Simplify right side
   78,619.71x = 4,644,672,832.35
5. Step 5: Solve for x
   x = 4,644,672,832.35/78,619.71
6. Step 6: Final answer
   x = 59,077.72