Finding the Fourth Proportional to 112,818.69, 155,656.40 and 64,419

Step by Step Solution

1. Step 1: Write the proportion equation
   112,818.69 : 155,656.40 = 64,419 : x
2. Step 2: Convert to fraction form
   112,818.69/155,656.40 = 64,419/x
3. Step 3: Cross multiply
   112,818.69x = 155,656.40 × 64,419
4. Step 4: Simplify right side
   112,818.69x = 10,027,229,309.51
5. Step 5: Solve for x
   x = 10,027,229,309.51/112,818.69
6. Step 6: Final answer
   x = 88,879.15