Finding the Fourth Proportional to 1,430.75, 2,147.51 and 690.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,430.75 : 2,147.51 = 690.88 : x
2. Step 2: Convert to fraction form
   1,430.75/2,147.51 = 690.88/x
3. Step 3: Cross multiply
   1,430.75x = 2,147.51 × 690.88
4. Step 4: Simplify right side
   1,430.75x = 1,483,662.89
5. Step 5: Solve for x
   x = 1,483,662.89/1,430.75
6. Step 6: Final answer
   x = 1,036.99