Finding the Fourth Proportional to 99,907.19, 149,763.37 and 39,917.78

Step by Step Solution

1. Step 1: Write the proportion equation
   99,907.19 : 149,763.37 = 39,917.78 : x
2. Step 2: Convert to fraction form
   99,907.19/149,763.37 = 39,917.78/x
3. Step 3: Cross multiply
   99,907.19x = 149,763.37 × 39,917.78
4. Step 4: Simplify right side
   99,907.19x = 5,978,221,255.72
5. Step 5: Solve for x
   x = 5,978,221,255.72/99,907.19
6. Step 6: Final answer
   x = 59,837.75