Finding the Fourth Proportional to 66,978, 92,430.72 and 37,170

Step by Step Solution

1. Step 1: Write the proportion equation
   66,978 : 92,430.72 = 37,170 : x
2. Step 2: Convert to fraction form
   66,978/92,430.72 = 37,170/x
3. Step 3: Cross multiply
   66,978x = 92,430.72 × 37,170
4. Step 4: Simplify right side
   66,978x = 3,435,649,862.40
5. Step 5: Solve for x
   x = 3,435,649,862.40/66,978
6. Step 6: Final answer
   x = 51,295.20