Finding the Fourth Proportional to 76,315.74, 105,312.06 and 42,321.57

Step by Step Solution

1. Step 1: Write the proportion equation
   76,315.74 : 105,312.06 = 42,321.57 : x
2. Step 2: Convert to fraction form
   76,315.74/105,312.06 = 42,321.57/x
3. Step 3: Cross multiply
   76,315.74x = 105,312.06 × 42,321.57
4. Step 4: Simplify right side
   76,315.74x = 4,456,971,719.13
5. Step 5: Solve for x
   x = 4,456,971,719.13/76,315.74
6. Step 6: Final answer
   x = 58,401.74