Finding the Fourth Proportional to 21,390,568.72, 29,522,758.10 and 12,693,536.75

Step by Step Solution

1. Step 1: Write the proportion equation
   21,390,568.72 : 29,522,758.10 = 12,693,536.75 : x
2. Step 2: Convert to fraction form
   21,390,568.72/29,522,758.10 = 12,693,536.75/x
3. Step 3: Cross multiply
   21,390,568.72x = 29,522,758.10 × 12,693,536.75
4. Step 4: Simplify right side
   21,390,568.72x = 374,748,214,914,049.38
5. Step 5: Solve for x
   x = 374,748,214,914,049.38/21,390,568.72
6. Step 6: Final answer
   x = 17,519,319.84