Finding the Fourth Proportional to 10,209.63, 15,312.81 and 3,972.50

Step by Step Solution

1. Step 1: Write the proportion equation
   10,209.63 : 15,312.81 = 3,972.50 : x
2. Step 2: Convert to fraction form
   10,209.63/15,312.81 = 3,972.50/x
3. Step 3: Cross multiply
   10,209.63x = 15,312.81 × 3,972.50
4. Step 4: Simplify right side
   10,209.63x = 60,830,061.16
5. Step 5: Solve for x
   x = 60,830,061.16/10,209.63
6. Step 6: Final answer
   x = 5,958.11