Finding the Fourth Proportional to 12,781,620.56, 17,638,755.72 and 7,274,725.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,781,620.56 : 17,638,755.72 = 7,274,725.20 : x
2. Step 2: Convert to fraction form
   12,781,620.56/17,638,755.72 = 7,274,725.20/x
3. Step 3: Cross multiply
   12,781,620.56x = 17,638,755.72 × 7,274,725.20
4. Step 4: Simplify right side
   12,781,620.56x = 128,317,100,732,928.14
5. Step 5: Solve for x
   x = 128,317,100,732,928.14/12,781,620.56
6. Step 6: Final answer
   x = 10,039,188.70