Finding the Fourth Proportional to 56,819.58, 78,410.52 and 30,978.15

Step by Step Solution

1. Step 1: Write the proportion equation
   56,819.58 : 78,410.52 = 30,978.15 : x
2. Step 2: Convert to fraction form
   56,819.58/78,410.52 = 30,978.15/x
3. Step 3: Cross multiply
   56,819.58x = 78,410.52 × 30,978.15
4. Step 4: Simplify right side
   56,819.58x = 2,429,012,850.14
5. Step 5: Solve for x
   x = 2,429,012,850.14/56,819.58
6. Step 6: Final answer
   x = 42,749.57