Finding the Fourth Proportional to 21,018,298.72, 29,005,574.16 and 12,314,388.64

Step by Step Solution

1. Step 1: Write the proportion equation
   21,018,298.72 : 29,005,574.16 = 12,314,388.64 : x
2. Step 2: Convert to fraction form
   21,018,298.72/29,005,574.16 = 12,314,388.64/x
3. Step 3: Cross multiply
   21,018,298.72x = 29,005,574.16 × 12,314,388.64
4. Step 4: Simplify right side
   21,018,298.72x = 357,185,912,932,581.56
5. Step 5: Solve for x
   x = 357,185,912,932,581.56/21,018,298.72
6. Step 6: Final answer
   x = 16,994,044.94