Finding the Fourth Proportional to 112,819.69, 155,657.77 and 64,420

Step by Step Solution

1. Step 1: Write the proportion equation
   112,819.69 : 155,657.77 = 64,420 : x
2. Step 2: Convert to fraction form
   112,819.69/155,657.77 = 64,420/x
3. Step 3: Cross multiply
   112,819.69x = 155,657.77 × 64,420
4. Step 4: Simplify right side
   112,819.69x = 10,027,473,543.40
5. Step 5: Solve for x
   x = 10,027,473,543.40/112,819.69
6. Step 6: Final answer
   x = 88,880.53