Finding the Fourth Proportional to 1,642.15, 2,267.46 and 1,012.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,642.15 : 2,267.46 = 1,012.99 : x
2. Step 2: Convert to fraction form
   1,642.15/2,267.46 = 1,012.99/x
3. Step 3: Cross multiply
   1,642.15x = 2,267.46 × 1,012.99
4. Step 4: Simplify right side
   1,642.15x = 2,296,914.31
5. Step 5: Solve for x
   x = 2,296,914.31/1,642.15
6. Step 6: Final answer
   x = 1,398.72