Finding the Fourth Proportional to 9,911.88, 14,868.63 and 4,978.98

Step by Step Solution

1. Step 1: Write the proportion equation
   9,911.88 : 14,868.63 = 4,978.98 : x
2. Step 2: Convert to fraction form
   9,911.88/14,868.63 = 4,978.98/x
3. Step 3: Cross multiply
   9,911.88x = 14,868.63 × 4,978.98
4. Step 4: Simplify right side
   9,911.88x = 74,030,611.40
5. Step 5: Solve for x
   x = 74,030,611.40/9,911.88
6. Step 6: Final answer
   x = 7,468.88