Finding the Fourth Proportional to 9,986.07, 13,780.71 and 5,510.01

Step by Step Solution

1. Step 1: Write the proportion equation
   9,986.07 : 13,780.71 = 5,510.01 : x
2. Step 2: Convert to fraction form
   9,986.07/13,780.71 = 5,510.01/x
3. Step 3: Cross multiply
   9,986.07x = 13,780.71 × 5,510.01
4. Step 4: Simplify right side
   9,986.07x = 75,931,849.91
5. Step 5: Solve for x
   x = 75,931,849.91/9,986.07
6. Step 6: Final answer
   x = 7,603.78