Finding the Fourth Proportional to 1,399.14, 2,097.34 and 521.00

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.14 : 2,097.34 = 521.00 : x
2. Step 2: Convert to fraction form
   1,399.14/2,097.34 = 521.00/x
3. Step 3: Cross multiply
   1,399.14x = 2,097.34 × 521.00
4. Step 4: Simplify right side
   1,399.14x = 1,092,709.55
5. Step 5: Solve for x
   x = 1,092,709.55/1,399.14
6. Step 6: Final answer
   x = 780.99