Finding the Fourth Proportional to 21,627.57, 29,670.15 and 21,423.45

Step by Step Solution

1. Step 1: Write the proportion equation
   21,627.57 : 29,670.15 = 21,423.45 : x
2. Step 2: Convert to fraction form
   21,627.57/29,670.15 = 21,423.45/x
3. Step 3: Cross multiply
   21,627.57x = 29,670.15 × 21,423.45
4. Step 4: Simplify right side
   21,627.57x = 635,636,975.02
5. Step 5: Solve for x
   x = 635,636,975.02/21,627.57
6. Step 6: Final answer
   x = 29,390.12