Finding the Fourth Proportional to 21,670.72, 32,486.64 and 7,816.48

Step by Step Solution

1. Step 1: Write the proportion equation
   21,670.72 : 32,486.64 = 7,816.48 : x
2. Step 2: Convert to fraction form
   21,670.72/32,486.64 = 7,816.48/x
3. Step 3: Cross multiply
   21,670.72x = 32,486.64 × 7,816.48
4. Step 4: Simplify right side
   21,670.72x = 253,931,171.83
5. Step 5: Solve for x
   x = 253,931,171.83/21,670.72
6. Step 6: Final answer
   x = 11,717.71