Finding the Fourth Proportional to 56,830, 78,425.40 and 31,681.12

Step by Step Solution

1. Step 1: Write the proportion equation
   56,830 : 78,425.40 = 31,681.12 : x
2. Step 2: Convert to fraction form
   56,830/78,425.40 = 31,681.12/x
3. Step 3: Cross multiply
   56,830x = 78,425.40 × 31,681.12
4. Step 4: Simplify right side
   56,830x = 2,484,604,508.45
5. Step 5: Solve for x
   x = 2,484,604,508.45/56,830
6. Step 6: Final answer
   x = 43,719.95