Finding the Fourth Proportional to 99,709.79, 137,597.00 and 54,388.80

Step by Step Solution

1. Step 1: Write the proportion equation
   99,709.79 : 137,597.00 = 54,388.80 : x
2. Step 2: Convert to fraction form
   99,709.79/137,597.00 = 54,388.80/x
3. Step 3: Cross multiply
   99,709.79x = 137,597.00 × 54,388.80
4. Step 4: Simplify right side
   99,709.79x = 7,483,735,441.66
5. Step 5: Solve for x
   x = 7,483,735,441.66/99,709.79
6. Step 6: Final answer
   x = 75,055.18