Finding the Fourth Proportional to 13,316.72, 19,969.89 and 4,992.20

Step by Step Solution

1. Step 1: Write the proportion equation
   13,316.72 : 19,969.89 = 4,992.20 : x
2. Step 2: Convert to fraction form
   13,316.72/19,969.89 = 4,992.20/x
3. Step 3: Cross multiply
   13,316.72x = 19,969.89 × 4,992.20
4. Step 4: Simplify right side
   13,316.72x = 99,693,585.01
5. Step 5: Solve for x
   x = 99,693,585.01/13,316.72
6. Step 6: Final answer
   x = 7,486.35