Finding the Fourth Proportional to 65,788, 90,789.60 and 35,980

Step by Step Solution

1. Step 1: Write the proportion equation
   65,788 : 90,789.60 = 35,980 : x
2. Step 2: Convert to fraction form
   65,788/90,789.60 = 35,980/x
3. Step 3: Cross multiply
   65,788x = 90,789.60 × 35,980
4. Step 4: Simplify right side
   65,788x = 3,266,609,808
5. Step 5: Solve for x
   x = 3,266,609,808/65,788
6. Step 6: Final answer
   x = 49,653.58