Finding the Fourth Proportional to 77,112.72, 106,407 and 43,578.72

Step by Step Solution

1. Step 1: Write the proportion equation
   77,112.72 : 106,407 = 43,578.72 : x
2. Step 2: Convert to fraction form
   77,112.72/106,407 = 43,578.72/x
3. Step 3: Cross multiply
   77,112.72x = 106,407 × 43,578.72
4. Step 4: Simplify right side
   77,112.72x = 4,637,080,859.04
5. Step 5: Solve for x
   x = 4,637,080,859.04/77,112.72
6. Step 6: Final answer
   x = 60,133.80