Finding the Fourth Proportional to 1,301.59, 1,951.18 and 521.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,301.59 : 1,951.18 = 521.40 : x
2. Step 2: Convert to fraction form
   1,301.59/1,951.18 = 521.40/x
3. Step 3: Cross multiply
   1,301.59x = 1,951.18 × 521.40
4. Step 4: Simplify right side
   1,301.59x = 1,017,345.25
5. Step 5: Solve for x
   x = 1,017,345.25/1,301.59
6. Step 6: Final answer
   x = 781.62