Finding the Fourth Proportional to 56,071.89, 77,378.98 and 30,578.19

Step by Step Solution

1. Step 1: Write the proportion equation
   56,071.89 : 77,378.98 = 30,578.19 : x
2. Step 2: Convert to fraction form
   56,071.89/77,378.98 = 30,578.19/x
3. Step 3: Cross multiply
   56,071.89x = 77,378.98 × 30,578.19
4. Step 4: Simplify right side
   56,071.89x = 2,366,108,822.98
5. Step 5: Solve for x
   x = 2,366,108,822.98/56,071.89
6. Step 6: Final answer
   x = 42,197.77