Finding the Fourth Proportional to 1,513.60, 2,090.87 and 1,434.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,513.60 : 2,090.87 = 1,434.78 : x
2. Step 2: Convert to fraction form
   1,513.60/2,090.87 = 1,434.78/x
3. Step 3: Cross multiply
   1,513.60x = 2,090.87 × 1,434.78
4. Step 4: Simplify right side
   1,513.60x = 2,999,938.46
5. Step 5: Solve for x
   x = 2,999,938.46/1,513.60
6. Step 6: Final answer
   x = 1,981.99