Finding the Fourth Proportional to 28,495.84, 42,738.72 and 7,720.96

Step by Step Solution

1. Step 1: Write the proportion equation
   28,495.84 : 42,738.72 = 7,720.96 : x
2. Step 2: Convert to fraction form
   28,495.84/42,738.72 = 7,720.96/x
3. Step 3: Cross multiply
   28,495.84x = 42,738.72 × 7,720.96
4. Step 4: Simplify right side
   28,495.84x = 329,983,947.57
5. Step 5: Solve for x
   x = 329,983,947.57/28,495.84
6. Step 6: Final answer
   x = 11,580.07