Finding the Fourth Proportional to 13,779.72, 19,010.16 and 8,190.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,779.72 : 19,010.16 = 8,190.72 : x
2. Step 2: Convert to fraction form
   13,779.72/19,010.16 = 8,190.72/x
3. Step 3: Cross multiply
   13,779.72x = 19,010.16 × 8,190.72
4. Step 4: Simplify right side
   13,779.72x = 155,706,897.72
5. Step 5: Solve for x
   x = 155,706,897.72/13,779.72
6. Step 6: Final answer
   x = 11,299.71