Finding the Fourth Proportional to 64,779.39, 89,410.28 and 42,078.83

Step by Step Solution

1. Step 1: Write the proportion equation
   64,779.39 : 89,410.28 = 42,078.83 : x
2. Step 2: Convert to fraction form
   64,779.39/89,410.28 = 42,078.83/x
3. Step 3: Cross multiply
   64,779.39x = 89,410.28 × 42,078.83
4. Step 4: Simplify right side
   64,779.39x = 3,762,279,314.93
5. Step 5: Solve for x
   x = 3,762,279,314.93/64,779.39
6. Step 6: Final answer
   x = 58,078.34