Finding the Fourth Proportional to 65,638.32, 90,703.50 and 53,697.30

Step by Step Solution

1. Step 1: Write the proportion equation
   65,638.32 : 90,703.50 = 53,697.30 : x
2. Step 2: Convert to fraction form
   65,638.32/90,703.50 = 53,697.30/x
3. Step 3: Cross multiply
   65,638.32x = 90,703.50 × 53,697.30
4. Step 4: Simplify right side
   65,638.32x = 4,870,533,050.55
5. Step 5: Solve for x
   x = 4,870,533,050.55/65,638.32
6. Step 6: Final answer
   x = 74,202.59