Finding the Fourth Proportional to 76,398.83, 105,428.75 and 42,405.33

Step by Step Solution

1. Step 1: Write the proportion equation
   76,398.83 : 105,428.75 = 42,405.33 : x
2. Step 2: Convert to fraction form
   76,398.83/105,428.75 = 42,405.33/x
3. Step 3: Cross multiply
   76,398.83x = 105,428.75 × 42,405.33
4. Step 4: Simplify right side
   76,398.83x = 4,470,740,723.21
5. Step 5: Solve for x
   x = 4,470,740,723.21/76,398.83
6. Step 6: Final answer
   x = 58,518.45