Finding the Fourth Proportional to 153,631.72, 211,891.59 and 99,933.89

Step by Step Solution

1. Step 1: Write the proportion equation
   153,631.72 : 211,891.59 = 99,933.89 : x
2. Step 2: Convert to fraction form
   153,631.72/211,891.59 = 99,933.89/x
3. Step 3: Cross multiply
   153,631.72x = 211,891.59 × 99,933.89
4. Step 4: Simplify right side
   153,631.72x = 21,175,150,846.99
5. Step 5: Solve for x
   x = 21,175,150,846.99/153,631.72
6. Step 6: Final answer
   x = 137,830.59