Finding the Fourth Proportional to 1,623.89, 2,240.82 and 915.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,623.89 : 2,240.82 = 915.63 : x
2. Step 2: Convert to fraction form
   1,623.89/2,240.82 = 915.63/x
3. Step 3: Cross multiply
   1,623.89x = 2,240.82 × 915.63
4. Step 4: Simplify right side
   1,623.89x = 2,051,762.02
5. Step 5: Solve for x
   x = 2,051,762.02/1,623.89
6. Step 6: Final answer
   x = 1,263.49