Finding the Fourth Proportional to 1,412.63, 2,116.60 and 999.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,412.63 : 2,116.60 = 999.72 : x
2. Step 2: Convert to fraction form
   1,412.63/2,116.60 = 999.72/x
3. Step 3: Cross multiply
   1,412.63x = 2,116.60 × 999.72
4. Step 4: Simplify right side
   1,412.63x = 2,116,007.35
5. Step 5: Solve for x
   x = 2,116,007.35/1,412.63
6. Step 6: Final answer
   x = 1,497.92