Finding the Fourth Proportional to 1,434.65, 2,151.43 and 612.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,434.65 : 2,151.43 = 612.50 : x
2. Step 2: Convert to fraction form
   1,434.65/2,151.43 = 612.50/x
3. Step 3: Cross multiply
   1,434.65x = 2,151.43 × 612.50
4. Step 4: Simplify right side
   1,434.65x = 1,317,738.59
5. Step 5: Solve for x
   x = 1,317,738.59/1,434.65
6. Step 6: Final answer
   x = 918.51