Finding the Fourth Proportional to 13,113.59, 19,668.77 and 5,314.91

Step by Step Solution

1. Step 1: Write the proportion equation
   13,113.59 : 19,668.77 = 5,314.91 : x
2. Step 2: Convert to fraction form
   13,113.59/19,668.77 = 5,314.91/x
3. Step 3: Cross multiply
   13,113.59x = 19,668.77 × 5,314.91
4. Step 4: Simplify right side
   13,113.59x = 104,537,715.79
5. Step 5: Solve for x
   x = 104,537,715.79/13,113.59
6. Step 6: Final answer
   x = 7,971.71