Finding the Fourth Proportional to 9,779.61, 13,501.71 and 6,428.03

Step by Step Solution

1. Step 1: Write the proportion equation
   9,779.61 : 13,501.71 = 6,428.03 : x
2. Step 2: Convert to fraction form
   9,779.61/13,501.71 = 6,428.03/x
3. Step 3: Cross multiply
   9,779.61x = 13,501.71 × 6,428.03
4. Step 4: Simplify right side
   9,779.61x = 86,789,430.69
5. Step 5: Solve for x
   x = 86,789,430.69/9,779.61
6. Step 6: Final answer
   x = 8,874.53