Finding the Fourth Proportional to 13,779.69, 19,016.18 and 7,811.22

Step by Step Solution

1. Step 1: Write the proportion equation
   13,779.69 : 19,016.18 = 7,811.22 : x
2. Step 2: Convert to fraction form
   13,779.69/19,016.18 = 7,811.22/x
3. Step 3: Cross multiply
   13,779.69x = 19,016.18 × 7,811.22
4. Step 4: Simplify right side
   13,779.69x = 148,539,526.48
5. Step 5: Solve for x
   x = 148,539,526.48/13,779.69
6. Step 6: Final answer
   x = 10,779.60