Finding the Fourth Proportional to 35,985.72, 53,978.50 and 9,690.49

Step by Step Solution

1. Step 1: Write the proportion equation
   35,985.72 : 53,978.50 = 9,690.49 : x
2. Step 2: Convert to fraction form
   35,985.72/53,978.50 = 9,690.49/x
3. Step 3: Cross multiply
   35,985.72x = 53,978.50 × 9,690.49
4. Step 4: Simplify right side
   35,985.72x = 523,077,796.12
5. Step 5: Solve for x
   x = 523,077,796.12/35,985.72
6. Step 6: Final answer
   x = 14,535.70