Finding the Fourth Proportional to 78,678.77, 108,576.63 and 42,869.07

Step by Step Solution

1. Step 1: Write the proportion equation
   78,678.77 : 108,576.63 = 42,869.07 : x
2. Step 2: Convert to fraction form
   78,678.77/108,576.63 = 42,869.07/x
3. Step 3: Cross multiply
   78,678.77x = 108,576.63 × 42,869.07
4. Step 4: Simplify right side
   78,678.77x = 4,654,579,151.83
5. Step 5: Solve for x
   x = 4,654,579,151.83/78,678.77
6. Step 6: Final answer
   x = 59,159.28