Finding the Fourth Proportional to 13,085.46, 19,636.74 and 7,816.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,085.46 : 19,636.74 = 7,816.50 : x
2. Step 2: Convert to fraction form
   13,085.46/19,636.74 = 7,816.50/x
3. Step 3: Cross multiply
   13,085.46x = 19,636.74 × 7,816.50
4. Step 4: Simplify right side
   13,085.46x = 153,490,578.21
5. Step 5: Solve for x
   x = 153,490,578.21/13,085.46
6. Step 6: Final answer
   x = 11,729.86