Finding the Fourth Proportional to 9,918.72, 13,690.62 and 5,672.03

Step by Step Solution

1. Step 1: Write the proportion equation
   9,918.72 : 13,690.62 = 5,672.03 : x
2. Step 2: Convert to fraction form
   9,918.72/13,690.62 = 5,672.03/x
3. Step 3: Cross multiply
   9,918.72x = 13,690.62 × 5,672.03
4. Step 4: Simplify right side
   9,918.72x = 77,653,538.91
5. Step 5: Solve for x
   x = 77,653,538.91/9,918.72
6. Step 6: Final answer
   x = 7,828.99