Finding the Fourth Proportional to 78,576.17, 108,437.40 and 42,768.50

Step by Step Solution

1. Step 1: Write the proportion equation
   78,576.17 : 108,437.40 = 42,768.50 : x
2. Step 2: Convert to fraction form
   78,576.17/108,437.40 = 42,768.50/x
3. Step 3: Cross multiply
   78,576.17x = 108,437.40 × 42,768.50
4. Step 4: Simplify right side
   78,576.17x = 4,637,704,399.71
5. Step 5: Solve for x
   x = 4,637,704,399.71/78,576.17
6. Step 6: Final answer
   x = 59,021.77