Finding the Fourth Proportional to 91,303.80, 136,970.42 and 28,123.91

Step by Step Solution

1. Step 1: Write the proportion equation
   91,303.80 : 136,970.42 = 28,123.91 : x
2. Step 2: Convert to fraction form
   91,303.80/136,970.42 = 28,123.91/x
3. Step 3: Cross multiply
   91,303.80x = 136,970.42 × 28,123.91
4. Step 4: Simplify right side
   91,303.80x = 3,852,143,764.74
5. Step 5: Solve for x
   x = 3,852,143,764.74/91,303.80
6. Step 6: Final answer
   x = 42,190.40