Finding the Fourth Proportional to 90,870.34, 136,259.70 and 52,931.83

Step by Step Solution

1. Step 1: Write the proportion equation
   90,870.34 : 136,259.70 = 52,931.83 : x
2. Step 2: Convert to fraction form
   90,870.34/136,259.70 = 52,931.83/x
3. Step 3: Cross multiply
   90,870.34x = 136,259.70 × 52,931.83
4. Step 4: Simplify right side
   90,870.34x = 7,212,475,276.25
5. Step 5: Solve for x
   x = 7,212,475,276.25/90,870.34
6. Step 6: Final answer
   x = 79,371.06