Finding the Fourth Proportional to 103,499.40, 155,247.90 and 72,978.84

Step by Step Solution

1. Step 1: Write the proportion equation
   103,499.40 : 155,247.90 = 72,978.84 : x
2. Step 2: Convert to fraction form
   103,499.40/155,247.90 = 72,978.84/x
3. Step 3: Cross multiply
   103,499.40x = 155,247.90 × 72,978.84
4. Step 4: Simplify right side
   103,499.40x = 11,329,811,654.44
5. Step 5: Solve for x
   x = 11,329,811,654.44/103,499.40
6. Step 6: Final answer
   x = 109,467.41