Finding the Fourth Proportional to 76,381.46, 105,406.28 and 42,390.35

Step by Step Solution

1. Step 1: Write the proportion equation
   76,381.46 : 105,406.28 = 42,390.35 : x
2. Step 2: Convert to fraction form
   76,381.46/105,406.28 = 42,390.35/x
3. Step 3: Cross multiply
   76,381.46x = 105,406.28 × 42,390.35
4. Step 4: Simplify right side
   76,381.46x = 4,468,209,152.96
5. Step 5: Solve for x
   x = 4,468,209,152.96/76,381.46
6. Step 6: Final answer
   x = 58,498.61