Finding the Fourth Proportional to 77,002.56, 115,434.72 and 27,720

Step by Step Solution

1. Step 1: Write the proportion equation
   77,002.56 : 115,434.72 = 27,720 : x
2. Step 2: Convert to fraction form
   77,002.56/115,434.72 = 27,720/x
3. Step 3: Cross multiply
   77,002.56x = 115,434.72 × 27,720
4. Step 4: Simplify right side
   77,002.56x = 3,199,850,438.40
5. Step 5: Solve for x
   x = 3,199,850,438.40/77,002.56
6. Step 6: Final answer
   x = 41,555.12