Finding the Fourth Proportional to 78,576.72, 108,438.17 and 42,769.05

Step by Step Solution

1. Step 1: Write the proportion equation
   78,576.72 : 108,438.17 = 42,769.05 : x
2. Step 2: Convert to fraction form
   78,576.72/108,438.17 = 42,769.05/x
3. Step 3: Cross multiply
   78,576.72x = 108,438.17 × 42,769.05
4. Step 4: Simplify right side
   78,576.72x = 4,637,796,758.60
5. Step 5: Solve for x
   x = 4,637,796,758.60/78,576.72
6. Step 6: Final answer
   x = 59,022.53