Finding the Fourth Proportional to 21,605,622.72, 29,691,061.04 and 20,606,484.48

Step by Step Solution

1. Step 1: Write the proportion equation
   21,605,622.72 : 29,691,061.04 = 20,606,484.48 : x
2. Step 2: Convert to fraction form
   21,605,622.72/29,691,061.04 = 20,606,484.48/x
3. Step 3: Cross multiply
   21,605,622.72x = 29,691,061.04 × 20,606,484.48
4. Step 4: Simplify right side
   21,605,622.72x = 611,828,388,515,492.62
5. Step 5: Solve for x
   x = 611,828,388,515,492.62/21,605,622.72
6. Step 6: Final answer
   x = 28,318,016.86