Finding the Fourth Proportional to 78,267.72, 117,404.82 and 31,521

Step by Step Solution

1. Step 1: Write the proportion equation
   78,267.72 : 117,404.82 = 31,521 : x
2. Step 2: Convert to fraction form
   78,267.72/117,404.82 = 31,521/x
3. Step 3: Cross multiply
   78,267.72x = 117,404.82 × 31,521
4. Step 4: Simplify right side
   78,267.72x = 3,700,717,331.22
5. Step 5: Solve for x
   x = 3,700,717,331.22/78,267.72
6. Step 6: Final answer
   x = 47,282.80