Finding the Fourth Proportional to 221,036.78, 331,588.12 and 78,870.98

Step by Step Solution

1. Step 1: Write the proportion equation
   221,036.78 : 331,588.12 = 78,870.98 : x
2. Step 2: Convert to fraction form
   221,036.78/331,588.12 = 78,870.98/x
3. Step 3: Cross multiply
   221,036.78x = 331,588.12 × 78,870.98
4. Step 4: Simplify right side
   221,036.78x = 26,152,679,980.76
5. Step 5: Solve for x
   x = 26,152,679,980.76/221,036.78
6. Step 6: Final answer
   x = 118,318.23