Finding the Fourth Proportional to 77,256.96, 106,640.28 and 47,061.78

Step by Step Solution

1. Step 1: Write the proportion equation
   77,256.96 : 106,640.28 = 47,061.78 : x
2. Step 2: Convert to fraction form
   77,256.96/106,640.28 = 47,061.78/x
3. Step 3: Cross multiply
   77,256.96x = 106,640.28 × 47,061.78
4. Step 4: Simplify right side
   77,256.96x = 5,018,681,396.50
5. Step 5: Solve for x
   x = 5,018,681,396.50/77,256.96
6. Step 6: Final answer
   x = 64,960.90