Finding the Fourth Proportional to 191,978.10, 288,111.15 and 98,435.70

Step by Step Solution

1. Step 1: Write the proportion equation
   191,978.10 : 288,111.15 = 98,435.70 : x
2. Step 2: Convert to fraction form
   191,978.10/288,111.15 = 98,435.70/x
3. Step 3: Cross multiply
   191,978.10x = 288,111.15 × 98,435.70
4. Step 4: Simplify right side
   191,978.10x = 28,360,422,728.06
5. Step 5: Solve for x
   x = 28,360,422,728.06/191,978.10
6. Step 6: Final answer
   x = 147,727.39