Finding the Fourth Proportional to 76,397.99, 105,428.42 and 42,406.77

Step by Step Solution

1. Step 1: Write the proportion equation
   76,397.99 : 105,428.42 = 42,406.77 : x
2. Step 2: Convert to fraction form
   76,397.99/105,428.42 = 42,406.77/x
3. Step 3: Cross multiply
   76,397.99x = 105,428.42 × 42,406.77
4. Step 4: Simplify right side
   76,397.99x = 4,470,879,100.75
5. Step 5: Solve for x
   x = 4,470,879,100.75/76,397.99
6. Step 6: Final answer
   x = 58,520.90