Finding the Fourth Proportional to 99,709.10, 137,598.98 and 54,388.05

Step by Step Solution

1. Step 1: Write the proportion equation
   99,709.10 : 137,598.98 = 54,388.05 : x
2. Step 2: Convert to fraction form
   99,709.10/137,598.98 = 54,388.05/x
3. Step 3: Cross multiply
   99,709.10x = 137,598.98 × 54,388.05
4. Step 4: Simplify right side
   99,709.10x = 7,483,739,932.25
5. Step 5: Solve for x
   x = 7,483,739,932.25/99,709.10
6. Step 6: Final answer
   x = 75,055.74