Finding the Fourth Proportional to 21,638,766.47, 32,406,631.27 and 12,521,644.61

Step by Step Solution

1. Step 1: Write the proportion equation
   21,638,766.47 : 32,406,631.27 = 12,521,644.61 : x
2. Step 2: Convert to fraction form
   21,638,766.47/32,406,631.27 = 12,521,644.61/x
3. Step 3: Cross multiply
   21,638,766.47x = 32,406,631.27 × 12,521,644.61
4. Step 4: Simplify right side
   21,638,766.47x = 405,784,319,576,915.69
5. Step 5: Solve for x
   x = 405,784,319,576,915.69/21,638,766.47
6. Step 6: Final answer
   x = 18,752,654.88