Finding the Fourth Proportional to 153,200.72, 211,447.32 and 99,410.24

Step by Step Solution

1. Step 1: Write the proportion equation
   153,200.72 : 211,447.32 = 99,410.24 : x
2. Step 2: Convert to fraction form
   153,200.72/211,447.32 = 99,410.24/x
3. Step 3: Cross multiply
   153,200.72x = 211,447.32 × 99,410.24
4. Step 4: Simplify right side
   153,200.72x = 21,020,028,828.56
5. Step 5: Solve for x
   x = 21,020,028,828.56/153,200.72
6. Step 6: Final answer
   x = 137,205.81