Finding the Fourth Proportional to 78,238.83, 107,969.64 and 42,428.83

Step by Step Solution

1. Step 1: Write the proportion equation
   78,238.83 : 107,969.64 = 42,428.83 : x
2. Step 2: Convert to fraction form
   78,238.83/107,969.64 = 42,428.83/x
3. Step 3: Cross multiply
   78,238.83x = 107,969.64 × 42,428.83
4. Step 4: Simplify right side
   78,238.83x = 4,581,025,500.72
5. Step 5: Solve for x
   x = 4,581,025,500.72/78,238.83
6. Step 6: Final answer
   x = 58,551.82