Finding the Fourth Proportional to 21,058,978.68, 29,061,582.84 and 12,357,296.28

Step by Step Solution

1. Step 1: Write the proportion equation
   21,058,978.68 : 29,061,582.84 = 12,357,296.28 : x
2. Step 2: Convert to fraction form
   21,058,978.68/29,061,582.84 = 12,357,296.28/x
3. Step 3: Cross multiply
   21,058,978.68x = 29,061,582.84 × 12,357,296.28
4. Step 4: Simplify right side
   21,058,978.68x = 359,122,589,519,643.81
5. Step 5: Solve for x
   x = 359,122,589,519,643.81/21,058,978.68
6. Step 6: Final answer
   x = 17,053,181.68