Finding the Fourth Proportional to 76,422.22, 105,457.90 and 42,428.72

Step by Step Solution

1. Step 1: Write the proportion equation
   76,422.22 : 105,457.90 = 42,428.72 : x
2. Step 2: Convert to fraction form
   76,422.22/105,457.90 = 42,428.72/x
3. Step 3: Cross multiply
   76,422.22x = 105,457.90 × 42,428.72
4. Step 4: Simplify right side
   76,422.22x = 4,474,443,710.89
5. Step 5: Solve for x
   x = 4,474,443,710.89/76,422.22
6. Step 6: Final answer
   x = 58,548.99