Finding the Fourth Proportional to 1,300.57, 1,951.95 and 521.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,300.57 : 1,951.95 = 521.12 : x
2. Step 2: Convert to fraction form
   1,300.57/1,951.95 = 521.12/x
3. Step 3: Cross multiply
   1,300.57x = 1,951.95 × 521.12
4. Step 4: Simplify right side
   1,300.57x = 1,017,200.18
5. Step 5: Solve for x
   x = 1,017,200.18/1,300.57
6. Step 6: Final answer
   x = 782.12