Finding the Fourth Proportional to 76,403, 105,435.30 and 42,411.76

Step by Step Solution

1. Step 1: Write the proportion equation
   76,403 : 105,435.30 = 42,411.76 : x
2. Step 2: Convert to fraction form
   76,403/105,435.30 = 42,411.76/x
3. Step 3: Cross multiply
   76,403x = 105,435.30 × 42,411.76
4. Step 4: Simplify right side
   76,403x = 4,471,696,639.13
5. Step 5: Solve for x
   x = 4,471,696,639.13/76,403
6. Step 6: Final answer
   x = 58,527.76