Finding the Fourth Proportional to 102,020.30, 152,881.05 and 91,490.30

Step by Step Solution

1. Step 1: Write the proportion equation
   102,020.30 : 152,881.05 = 91,490.30 : x
2. Step 2: Convert to fraction form
   102,020.30/152,881.05 = 91,490.30/x
3. Step 3: Cross multiply
   102,020.30x = 152,881.05 × 91,490.30
4. Step 4: Simplify right side
   102,020.30x = 13,987,133,128.82
5. Step 5: Solve for x
   x = 13,987,133,128.82/102,020.30
6. Step 6: Final answer
   x = 137,101.47