Finding the Fourth Proportional to 128,990.31, 193,378.83 and 49,011.72

Step by Step Solution

1. Step 1: Write the proportion equation
   128,990.31 : 193,378.83 = 49,011.72 : x
2. Step 2: Convert to fraction form
   128,990.31/193,378.83 = 49,011.72/x
3. Step 3: Cross multiply
   128,990.31x = 193,378.83 × 49,011.72
4. Step 4: Simplify right side
   128,990.31x = 9,477,829,069.89
5. Step 5: Solve for x
   x = 9,477,829,069.89/128,990.31
6. Step 6: Final answer
   x = 73,477.06