Finding the Fourth Proportional to 12,974,131.98, 17,904,675.87 and 7,173,288.21

Step by Step Solution

1. Step 1: Write the proportion equation
   12,974,131.98 : 17,904,675.87 = 7,173,288.21 : x
2. Step 2: Convert to fraction form
   12,974,131.98/17,904,675.87 = 7,173,288.21/x
3. Step 3: Cross multiply
   12,974,131.98x = 17,904,675.87 × 7,173,288.21
4. Step 4: Simplify right side
   12,974,131.98x = 128,435,400,322,142.50
5. Step 5: Solve for x
   x = 128,435,400,322,142.50/12,974,131.98
6. Step 6: Final answer
   x = 9,899,344.37