Finding the Fourth Proportional to 91,128.53, 136,714.72 and 28,799.03

Step by Step Solution

1. Step 1: Write the proportion equation
   91,128.53 : 136,714.72 = 28,799.03 : x
2. Step 2: Convert to fraction form
   91,128.53/136,714.72 = 28,799.03/x
3. Step 3: Cross multiply
   91,128.53x = 136,714.72 × 28,799.03
4. Step 4: Simplify right side
   91,128.53x = 3,937,251,322.72
5. Step 5: Solve for x
   x = 3,937,251,322.72/91,128.53
6. Step 6: Final answer
   x = 43,205.47