Finding the Fourth Proportional to 99,678.72, 149,303.68 and 47,009.28

Step by Step Solution

1. Step 1: Write the proportion equation
   99,678.72 : 149,303.68 = 47,009.28 : x
2. Step 2: Convert to fraction form
   99,678.72/149,303.68 = 47,009.28/x
3. Step 3: Cross multiply
   99,678.72x = 149,303.68 × 47,009.28
4. Step 4: Simplify right side
   99,678.72x = 7,018,658,498.15
5. Step 5: Solve for x
   x = 7,018,658,498.15/99,678.72
6. Step 6: Final answer
   x = 70,412.81