Finding the Fourth Proportional to 1,342.05, 2,012.86 and 520.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,342.05 : 2,012.86 = 520.71 : x
2. Step 2: Convert to fraction form
   1,342.05/2,012.86 = 520.71/x
3. Step 3: Cross multiply
   1,342.05x = 2,012.86 × 520.71
4. Step 4: Simplify right side
   1,342.05x = 1,048,116.33
5. Step 5: Solve for x
   x = 1,048,116.33/1,342.05
6. Step 6: Final answer
   x = 780.98