Finding the Fourth Proportional to 1,069.67, 1,602.32 and 521.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,069.67 : 1,602.32 = 521.39 : x
2. Step 2: Convert to fraction form
   1,069.67/1,602.32 = 521.39/x
3. Step 3: Cross multiply
   1,069.67x = 1,602.32 × 521.39
4. Step 4: Simplify right side
   1,069.67x = 835,435.02
5. Step 5: Solve for x
   x = 835,435.02/1,069.67
6. Step 6: Final answer
   x = 781.02