Finding the Fourth Proportional to 1,290.04, 1,933.98 and 520

Step by Step Solution

1. Step 1: Write the proportion equation
   1,290.04 : 1,933.98 = 520 : x
2. Step 2: Convert to fraction form
   1,290.04/1,933.98 = 520/x
3. Step 3: Cross multiply
   1,290.04x = 1,933.98 × 520
4. Step 4: Simplify right side
   1,290.04x = 1,005,669.60
5. Step 5: Solve for x
   x = 1,005,669.60/1,290.04
6. Step 6: Final answer
   x = 779.56