Finding the Fourth Proportional to 90,360.78, 124,702.11 and 56,389.38

Step by Step Solution

1. Step 1: Write the proportion equation
   90,360.78 : 124,702.11 = 56,389.38 : x
2. Step 2: Convert to fraction form
   90,360.78/124,702.11 = 56,389.38/x
3. Step 3: Cross multiply
   90,360.78x = 124,702.11 × 56,389.38
4. Step 4: Simplify right side
   90,360.78x = 7,031,874,667.59
5. Step 5: Solve for x
   x = 7,031,874,667.59/90,360.78
6. Step 6: Final answer
   x = 77,819.99