Finding the Fourth Proportional to 117,620, 162,315.60 and 64,628

Step by Step Solution

1. Step 1: Write the proportion equation
   117,620 : 162,315.60 = 64,628 : x
2. Step 2: Convert to fraction form
   117,620/162,315.60 = 64,628/x
3. Step 3: Cross multiply
   117,620x = 162,315.60 × 64,628
4. Step 4: Simplify right side
   117,620x = 10,490,132,596.80
5. Step 5: Solve for x
   x = 10,490,132,596.80/117,620
6. Step 6: Final answer
   x = 89,186.64