Finding the Fourth Proportional to 1,645.31, 2,468.27 and 779.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,645.31 : 2,468.27 = 779.63 : x
2. Step 2: Convert to fraction form
   1,645.31/2,468.27 = 779.63/x
3. Step 3: Cross multiply
   1,645.31x = 2,468.27 × 779.63
4. Step 4: Simplify right side
   1,645.31x = 1,924,326.95
5. Step 5: Solve for x
   x = 1,924,326.95/1,645.31
6. Step 6: Final answer
   x = 1,169.58