Finding the Fourth Proportional to 99,907.56, 149,763.94 and 39,918.15

Step by Step Solution

1. Step 1: Write the proportion equation
   99,907.56 : 149,763.94 = 39,918.15 : x
2. Step 2: Convert to fraction form
   99,907.56/149,763.94 = 39,918.15/x
3. Step 3: Cross multiply
   99,907.56x = 149,763.94 × 39,918.15
4. Step 4: Simplify right side
   99,907.56x = 5,978,299,421.51
5. Step 5: Solve for x
   x = 5,978,299,421.51/99,907.56
6. Step 6: Final answer
   x = 59,838.31