Finding the Fourth Proportional to 72,852.72, 109,257.48 and 31,290

Step by Step Solution

1. Step 1: Write the proportion equation
   72,852.72 : 109,257.48 = 31,290 : x
2. Step 2: Convert to fraction form
   72,852.72/109,257.48 = 31,290/x
3. Step 3: Cross multiply
   72,852.72x = 109,257.48 × 31,290
4. Step 4: Simplify right side
   72,852.72x = 3,418,666,549.20
5. Step 5: Solve for x
   x = 3,418,666,549.20/72,852.72
6. Step 6: Final answer
   x = 46,925.72