Finding the Fourth Proportional to 1,402.89, 2,105.42 and 915.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,402.89 : 2,105.42 = 915.81 : x
2. Step 2: Convert to fraction form
   1,402.89/2,105.42 = 915.81/x
3. Step 3: Cross multiply
   1,402.89x = 2,105.42 × 915.81
4. Step 4: Simplify right side
   1,402.89x = 1,928,160.11
5. Step 5: Solve for x
   x = 1,928,160.11/1,402.89
6. Step 6: Final answer
   x = 1,374.42