Finding the Fourth Proportional to 126,978.67, 190,300.90 and 70,845.21

Step by Step Solution

1. Step 1: Write the proportion equation
   126,978.67 : 190,300.90 = 70,845.21 : x
2. Step 2: Convert to fraction form
   126,978.67/190,300.90 = 70,845.21/x
3. Step 3: Cross multiply
   126,978.67x = 190,300.90 × 70,845.21
4. Step 4: Simplify right side
   126,978.67x = 13,481,907,223.69
5. Step 5: Solve for x
   x = 13,481,907,223.69/126,978.67
6. Step 6: Final answer
   x = 106,174.58