Finding the Fourth Proportional to 11,389.71, 15,706.31 and 7,612.89

Step by Step Solution

1. Step 1: Write the proportion equation
   11,389.71 : 15,706.31 = 7,612.89 : x
2. Step 2: Convert to fraction form
   11,389.71/15,706.31 = 7,612.89/x
3. Step 3: Cross multiply
   11,389.71x = 15,706.31 × 7,612.89
4. Step 4: Simplify right side
   11,389.71x = 119,570,313.37
5. Step 5: Solve for x
   x = 119,570,313.37/11,389.71
6. Step 6: Final answer
   x = 10,498.10