Finding the Fourth Proportional to 56,469.51, 77,928.71 and 30,978.18

Step by Step Solution

1. Step 1: Write the proportion equation
   56,469.51 : 77,928.71 = 30,978.18 : x
2. Step 2: Convert to fraction form
   56,469.51/77,928.71 = 30,978.18/x
3. Step 3: Cross multiply
   56,469.51x = 77,928.71 × 30,978.18
4. Step 4: Simplify right side
   56,469.51x = 2,414,089,450.66
5. Step 5: Solve for x
   x = 2,414,089,450.66/56,469.51
6. Step 6: Final answer
   x = 42,750.32