Finding the Fourth Proportional to 98,819.72, 136,369.86 and 54,107.72

Step by Step Solution

1. Step 1: Write the proportion equation
   98,819.72 : 136,369.86 = 54,107.72 : x
2. Step 2: Convert to fraction form
   98,819.72/136,369.86 = 54,107.72/x
3. Step 3: Cross multiply
   98,819.72x = 136,369.86 × 54,107.72
4. Step 4: Simplify right side
   98,819.72x = 7,378,662,201.32
5. Step 5: Solve for x
   x = 7,378,662,201.32/98,819.72
6. Step 6: Final answer
   x = 74,667.91