Finding the Fourth Proportional to 45,672.56, 68,547.72 and 17,990

Step by Step Solution

1. Step 1: Write the proportion equation
   45,672.56 : 68,547.72 = 17,990 : x
2. Step 2: Convert to fraction form
   45,672.56/68,547.72 = 17,990/x
3. Step 3: Cross multiply
   45,672.56x = 68,547.72 × 17,990
4. Step 4: Simplify right side
   45,672.56x = 1,233,173,482.80
5. Step 5: Solve for x
   x = 1,233,173,482.80/45,672.56
6. Step 6: Final answer
   x = 27,000.31