Finding the Fourth Proportional to 22,892.46, 31,590.73 and 12,820.40

Step by Step Solution

1. Step 1: Write the proportion equation
   22,892.46 : 31,590.73 = 12,820.40 : x
2. Step 2: Convert to fraction form
   22,892.46/31,590.73 = 12,820.40/x
3. Step 3: Cross multiply
   22,892.46x = 31,590.73 × 12,820.40
4. Step 4: Simplify right side
   22,892.46x = 405,005,794.89
5. Step 5: Solve for x
   x = 405,005,794.89/22,892.46
6. Step 6: Final answer
   x = 17,691.67