Finding the Fourth Proportional to 12,638,389.06, 17,440,806.09 and 7,056,721.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,638,389.06 : 17,440,806.09 = 7,056,721.72 : x
2. Step 2: Convert to fraction form
   12,638,389.06/17,440,806.09 = 7,056,721.72/x
3. Step 3: Cross multiply
   12,638,389.06x = 17,440,806.09 × 7,056,721.72
4. Step 4: Simplify right side
   12,638,389.06x = 123,074,915,149,611.27
5. Step 5: Solve for x
   x = 123,074,915,149,611.27/12,638,389.06
6. Step 6: Final answer
   x = 9,738,180.60