Finding the Fourth Proportional to 155,789.69, 215,017.79 and 148,690.17

Step by Step Solution

1. Step 1: Write the proportion equation
   155,789.69 : 215,017.79 = 148,690.17 : x
2. Step 2: Convert to fraction form
   155,789.69/215,017.79 = 148,690.17/x
3. Step 3: Cross multiply
   155,789.69x = 215,017.79 × 148,690.17
4. Step 4: Simplify right side
   155,789.69x = 31,971,031,004.67
5. Step 5: Solve for x
   x = 31,971,031,004.67/155,789.69
6. Step 6: Final answer
   x = 205,219.18